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155e7524 FI |
1 | /* |
2 | * linux/fs/nfs/blocklayout/blocklayout.h | |
3 | * | |
4 | * Module for the NFSv4.1 pNFS block layout driver. | |
5 | * | |
6 | * Copyright (c) 2006 The Regents of the University of Michigan. | |
7 | * All rights reserved. | |
8 | * | |
9 | * Andy Adamson <andros@citi.umich.edu> | |
10 | * Fred Isaman <iisaman@umich.edu> | |
11 | * | |
12 | * permission is granted to use, copy, create derivative works and | |
13 | * redistribute this software and such derivative works for any purpose, | |
14 | * so long as the name of the university of michigan is not used in | |
15 | * any advertising or publicity pertaining to the use or distribution | |
16 | * of this software without specific, written prior authorization. if | |
17 | * the above copyright notice or any other identification of the | |
18 | * university of michigan is included in any copy of any portion of | |
19 | * this software, then the disclaimer below must also be included. | |
20 | * | |
21 | * this software is provided as is, without representation from the | |
22 | * university of michigan as to its fitness for any purpose, and without | |
23 | * warranty by the university of michigan of any kind, either express | |
24 | * or implied, including without limitation the implied warranties of | |
25 | * merchantability and fitness for a particular purpose. the regents | |
26 | * of the university of michigan shall not be liable for any damages, | |
27 | * including special, indirect, incidental, or consequential damages, | |
28 | * with respect to any claim arising out or in connection with the use | |
29 | * of the software, even if it has been or is hereafter advised of the | |
30 | * possibility of such damages. | |
31 | */ | |
32 | #ifndef FS_NFS_NFS4BLOCKLAYOUT_H | |
33 | #define FS_NFS_NFS4BLOCKLAYOUT_H | |
34 | ||
35 | #include <linux/device-mapper.h> | |
36 | #include <linux/nfs_fs.h> | |
fe0a9b74 JR |
37 | #include <linux/sunrpc/rpc_pipe_fs.h> |
38 | ||
155e7524 FI |
39 | #include "../pnfs.h" |
40 | ||
fe0a9b74 JR |
41 | struct pnfs_block_dev { |
42 | struct list_head bm_node; | |
43 | struct nfs4_deviceid bm_mdevid; /* associated devid */ | |
44 | struct block_device *bm_mdev; /* meta device itself */ | |
45 | }; | |
46 | ||
155e7524 FI |
47 | enum exstate4 { |
48 | PNFS_BLOCK_READWRITE_DATA = 0, | |
49 | PNFS_BLOCK_READ_DATA = 1, | |
50 | PNFS_BLOCK_INVALID_DATA = 2, /* mapped, but data is invalid */ | |
51 | PNFS_BLOCK_NONE_DATA = 3 /* unmapped, it's a hole */ | |
52 | }; | |
53 | ||
54 | struct pnfs_inval_markings { | |
55 | /* STUB */ | |
56 | }; | |
57 | ||
58 | /* sector_t fields are all in 512-byte sectors */ | |
59 | struct pnfs_block_extent { | |
60 | struct kref be_refcnt; | |
61 | struct list_head be_node; /* link into lseg list */ | |
62 | struct nfs4_deviceid be_devid; /* FIXME: could use device cache instead */ | |
63 | struct block_device *be_mdev; | |
64 | sector_t be_f_offset; /* the starting offset in the file */ | |
65 | sector_t be_length; /* the size of the extent */ | |
66 | sector_t be_v_offset; /* the starting offset in the volume */ | |
67 | enum exstate4 be_state; /* the state of this extent */ | |
68 | struct pnfs_inval_markings *be_inval; /* tracks INVAL->RW transition */ | |
69 | }; | |
70 | ||
71 | static inline void | |
72 | BL_INIT_INVAL_MARKS(struct pnfs_inval_markings *marks, sector_t blocksize) | |
73 | { | |
74 | /* STUB */ | |
75 | } | |
76 | ||
77 | enum extentclass4 { | |
78 | RW_EXTENT = 0, /* READWRTE and INVAL */ | |
79 | RO_EXTENT = 1, /* READ and NONE */ | |
80 | EXTENT_LISTS = 2, | |
81 | }; | |
82 | ||
83 | struct pnfs_block_layout { | |
84 | struct pnfs_layout_hdr bl_layout; | |
85 | struct pnfs_inval_markings bl_inval; /* tracks INVAL->RW transition */ | |
86 | spinlock_t bl_ext_lock; /* Protects list manipulation */ | |
87 | struct list_head bl_extents[EXTENT_LISTS]; /* R and RW extents */ | |
88 | struct list_head bl_commit; /* Needs layout commit */ | |
89 | struct list_head bl_committing; /* Layout committing */ | |
90 | unsigned int bl_count; /* entries in bl_commit */ | |
91 | sector_t bl_blocksize; /* Server blocksize in sectors */ | |
92 | }; | |
93 | ||
94 | static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo) | |
95 | { | |
96 | return container_of(lo, struct pnfs_block_layout, bl_layout); | |
97 | } | |
98 | ||
a60d2ebd FI |
99 | static inline struct pnfs_block_layout * |
100 | BLK_LSEG2EXT(struct pnfs_layout_segment *lseg) | |
101 | { | |
102 | return BLK_LO2EXT(lseg->pls_layout); | |
103 | } | |
104 | ||
fe0a9b74 JR |
105 | struct bl_dev_msg { |
106 | int status; | |
107 | uint32_t major, minor; | |
108 | }; | |
109 | ||
110 | struct bl_msg_hdr { | |
111 | u8 type; | |
112 | u16 totallen; /* length of entire message, including hdr itself */ | |
113 | }; | |
114 | ||
115 | extern struct dentry *bl_device_pipe; | |
116 | extern wait_queue_head_t bl_wq; | |
117 | ||
118 | #define BL_DEVICE_UMOUNT 0x0 /* Umount--delete devices */ | |
119 | #define BL_DEVICE_MOUNT 0x1 /* Mount--create devices*/ | |
120 | #define BL_DEVICE_REQUEST_INIT 0x0 /* Start request */ | |
121 | #define BL_DEVICE_REQUEST_PROC 0x1 /* User level process succeeds */ | |
122 | #define BL_DEVICE_REQUEST_ERR 0x2 /* User level process fails */ | |
123 | ||
124 | /* blocklayoutdev.c */ | |
125 | ssize_t bl_pipe_upcall(struct file *, struct rpc_pipe_msg *, | |
126 | char __user *, size_t); | |
127 | ssize_t bl_pipe_downcall(struct file *, const char __user *, size_t); | |
128 | void bl_pipe_destroy_msg(struct rpc_pipe_msg *); | |
129 | struct block_device *nfs4_blkdev_get(dev_t dev); | |
130 | int nfs4_blkdev_put(struct block_device *bdev); | |
131 | struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server, | |
132 | struct pnfs_device *dev, | |
133 | struct list_head *sdlist); | |
134 | int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo, | |
135 | struct nfs4_layoutget_res *lgr, gfp_t gfp_flags); | |
136 | ||
025a70ed JR |
137 | /* blocklayoutdm.c */ |
138 | void bl_free_block_dev(struct pnfs_block_dev *bdev); | |
139 | ||
9e692969 | 140 | void bl_put_extent(struct pnfs_block_extent *be); |
155e7524 | 141 | #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */ |